Rihanna and Jameel have reportedly been dating for over a year now, and were last seen together celebrating Halloween in Boston. The couple managed to keep their relationship a secret for six months before they were snapped kissing in Spain over the summer.

Jameel is deputy president and vice chairman of family business Abdul Latif Jameel Domestic. The company owns the distribution rights to Toyota cars in Saudi Arabia and is one of the richest companies in the world. While Jameel's individual net worth is unknown the family has a reported worth of $US1.5 billion ($AUS1.97 billion), which Jameel stands to inherit one day.

Hassan Jameel's family has a reported worth of $US1.5 billion ($AUS1.97 billion), which Jameel stands to inherit. Image: Hassan Jameel

The Sun recently revealed Hassan has been married once before, tying the knot to art expert Lina Lazaar at the Paris Opera House in 2012. While Rihanna has had her own public romances - with previous ties to Drake, Travis Scott and Chris Brown - the Saudi Arabian billionaire is "intensely private" according to The Sun's source.

"His marriage was over before he met Rihanna, after getting a divorce from Lina, but it will still come as a shock to her millions of fans," the source told The Sun, adding: "Lina has also moved on with a new partner."

Rihanna is yet to confirm the engagement, vaguely captioning the Instagram post with a lone Christmas tree emoji.